Parts remover



March 6, 1956 C, E, sMn-H 2,737,139

PARTS REMOVER Filed Dec. 22, 1950 FIG. 1

w las 40 38 32 o Xi .s 33 3i :Wxk x w 6 5 FIG. 6 H6637 FIG. 8

INVENTOR.

C. E.. SMITH ATTORNEY Unite i This, invention relates to a parts removerand more particularly to a device adapted to be used in conjunction witha male die block for engaging and stripping a part formed by the diesfrom the female die block.

At the present time there are two methods in com.- mon use for removingparts from the female die block. One of these is known as the Marquettepins method, and the other involves the use of sharp welded'v spots onthe sides of the male die block.

In the Marquette pin method a oating ring with attached pins is utilizedwhich is in turn attached toy an air cylinder, these parts are locatedin the female die block and on the down stroke the male die block formsthe part and compressed air in the cylinder. The air compressed in thecylinder under the female die block expands and ejects the part duringthe upward movement of the male die block by means of the oating ringand the attached pins. This method does not function satisfactorilywhere the parts to be formed require coining, deep draws or the diesactually cause the metal to flow while being formed.

In, the. second method commonly utilized spots. are welded on the sidesof the male die block and are then dressed, down so that the spot lugtapers toward the female die block but has a sharp edge on the upperside at right angles to the side of the male die block. These spot lugsare usually about one-half inch long and ex.- tend from the male dieblock about lifteen, ten-thousandths of an inch, which is sutlicient tocause a owof metal` on the down stroke, distorts the part being formed,and causes a ange along the top edge which hasto be removed later in asubsequent operation thus scarring the inside of the part being formed.When the male. die block makes the return stroke, these sharp edgespulll the part from the female portion of the die. The parts are thenknocked off of the male part of the die.

ln, oneA preferred embodiment of the present invention a. parts removeris provided having a plug which may be inserted in a hole drilled atright angles into the. side of the male die block and a substantiallycylindricalv guide whichv is threaded into the plug. The guide isprovided with. a diametrical slot in which is mounted a sliding wedge ora pivoted element having serrated teeth on its outer edge which normallyextend beyond the side of the male die block. The sliding wedge almostdisappears into the male portion of the die during the down, stroke ofthe die press so that the serrated teeth only extend a very slightamount. The slight projection of the: teeth is. not snflicient todistort the part being formedY or to cause excessive ow of metal.However, on the upy stroke the serrated teeth grasp the formed part andreadily re.- move it from the female die block. Subsequently the partmay be readily knocked olf of the male die` block or stripped in aconventional manner.

One object of the present invention is to overcome the disadvantagesenumerated above and to provide a sim.- ple, inexpensive parts removerwhich may be readily attached to and removed from the male die block.

States Patent v 2,737,139 Patented Mar.' 6- 1956v "ice Another object ofthe present invention is to provide a parts remover which may be readilyinserted in a portion of the male die and may be conveniently replaced,whenever the operative portion thereof has become Worn.

Another object of the present invention isy to provide a parts removerwhich will effectively remove the formed part from the female die blockwithout any substantial damage to the part being formed.

Further objects and advantages of the invention will be apparent fromthe following. description taken in con.- iunction with the drawings,wherein:

Fig. 1 is a sectional view of the male and female die block with a sheetoi metal therebetween in position to be formed and showing one preferredembodiment ofthe present invention recessedy in each of the oppositeside walls of the male die block.;

Fig. 2. a similar sectional view illustrating' the parts shown in Fig. lin the second step of 4.the operation, where the.- sheet of metal hasbeen formedinto a part;

Fig. 3 a similar sectional'fviewiwvithf-'a portion of the female dieblock broken away showing the part removed from the female die block andheldon the male die block by' the. serrated teeth on the parts: remover;

Fig.. 4 anl exploded view showing the separate elements of the:preferred embodiment of the present invention, as illustrated in, Figs.l through; 3;

Fig. V5 a sectional view of one modified form of parts remover; f

Fig. 6 a Viewy of the partsl remover shown in Fig. 5, with the grippingelement inthe. upper position, engaging a part in. ar manner similar tothat shown in Fig. 3;

Fig.. 7 a sectional view of a still further modified form of partsremover made in accordance with the present invention; and

Fig.. 8 a view similar` to'y Fig. 'Z with the gripping ele mentv inoperative position for removing a part from the female die.

Referring now to the drawings in detail and more particularly to Fig..4, the separate elements of one preferred embodiment of thepresentinvention are; `shown in anv ex.- ploded: view and` consist ofa-cylindrical plug 10 which i-s provided with* a threaded opening 12extending therethrough and a slide guide 14 which. is provided with athreaded projection 16 adapted to engage. the threaded opening. 12.The.v slide. guide, 14l is. substantially cylindrical in shape and isprovided with a diametrical slot 18 which has an upwardly inclined endsurface 20. An opening 22 extends diametrically through the slide guide141 at right angles to the slot 1-8. Slide guide 14 is also providedwith a pair ofv shallow recesses 2'4 and 26 at diametricallyopposedpoints on, the end surface. Recesses 2,4 and 26; are. provided, forengagementY by a span.u ner' wrench for insertion, and removal of the.slide guide 14e inthe plug 10A inV a manner to be described'.subsequently.

A sliding; wedge or. gripper 28 is provided with an inclinedV rear edgesurface 30. at substantially the same angle, as; the inc1ined-surface20and a forward. edge serrated: as: shown at 32 to provide aplurality ofteeth and having af beveled upper corner 33. An elongated opening 34 isYadapted, to slidably receiver a pin 36 which may he inserted with. a.force t into the diametrically opposed openingsv 22 inthe slide guide14.

The: elements shown in Fig. 4 areassembled in a mannerl which: isclearly apparent from; the; sectional views shown in; Figs. l through,3. The plugs 10 may be shrunk or force fitted into the bottomY of one ormore cylindrical recesses 38 formed'. preferably in the. diametricallyopposedl sides ofthe male die block 4.0,y as shown in Figs.,1 through 3.The slide guide 15. has been previously assembled with the. slidingwedge 28 which is retained in an operative position by thel pin 36, andis screwed into the plug 10 by a spanner wrench engaging the recesses 24and 26.

It will be obvious that in the position as shown in Fig. 3 the slidingwedge 28 will move downwardly on the pin 36 so that the serrated edge 32may extend out a sufficient predetermined distance beyond the surface ofthe male die block to remove the article. rI`he exact extent of theprojection will vary in different usages depending largely on the sizeof the parts being formed and the metal of which the part is being made.In some common usages this may pretflerably be in the order of a fewthousandths of an mc When the male die block 40 is pressed downwardly toform the sheet material 42 inthe female die block 44, as shown in Fig.2, the slidingv wedge 28 is forced to an upper position on the pin 36and the serrated teeth 32 will extend only a very slight distance. Insome common usages this may preferably be in the order of only a few tenthousandths of an inch which is just sufficient to provide engagementwith the part formed in the manner shown in Fig. 3 without distorting orscarring the interior surfaces.

It will be apparent that during the downward movement of the male dieblock 40 the sliding wedge or gripper 28 will be wedged upwardly andinwardly to its substantially flush position with the serrated edge 32projecting a very slight amount, but on the upward stroke the engagementof the tips of the teeth on the serrated edge 32 against the surface ofpart formed will urge the gripper 28 downwardly and outwardly into rmengagement with the part being removed.

After the part has been removed from the female die block 4, it will bevery simple to knock the part thus formed off of the male die block 40with a suitable instrument, since the part formed will tend to springslightly away from the male die block 4l). If desired, a suitable diestripper may be used for removing the parts from the male die blockduring the latter part of the upward stroke, and may have a thin elementwhich will enter between the part and the male die block 40 and engagethe upper beveled corner 33 of the gripper 28 to force it inwardly outof engagement with the part formed. When the teeth on the serrated edge32 have worn sufficiently to become inoperative, the parts remover canbe removed by a spanner wrench engaging recesses 24 and 26 and a newremover inserted. If for some reason the new remover does not line upproperly with the serrated edge substantially parallel to the sidesurface of the male die portion 40, the plug 10 may be readily drilledout and a complete new unit inserted.

The modied form of parts remover shown in Figs. and 6 is similar to theparts remover shown in Figs. 1 through 3 as far as its insertion and usein the male die block, and is likewise provided with a cylindrical plughaving a threaded opening 12 adapted to receive the threaded projection46 on a cylindrical guide element 48 which is provided with a transverserecess 50 in which a pivoted gripping element 52 is mounted on a pin 54.Gripping element 52 is provided with a serrated edge S6 which isdisposed at a slight angle, so that in the upper position, as shown inFig. 6, the tips of the serrated teeth will extend a very slightdistance beyond the surface of the male die block to grip the sheet ofmaterial 42 as shown. The end of the pivoted gripping element extendsslightly, as shown in Fig. 5, during the downward stroke of the male dieblock. While the part is being formed, it engages the end of thegripping element and moves it up into the position shown in Fig. 6, andon the upward stroke the serrated teeth engage the surface of the part42 to remove it from the female die in a manner somewhat similar to thatillustrated in Figs. l through 3.

In the modication shown in Figs. 7 and 8, the threaded opening 12 in theplug 10 receives the threaded projection 58 on the guide member 60 whichis provided with a transverse or diametrical slot 62 in which a grippingelement 63 is slidably mounted. The gripping element 63 has an elongatedslot 64 through which extends the flat sided pin 66. The grippingelement 63 is likewise provided with a serrated edge 68. A substantiallyJ- shaped arm 70 is pivotally mounted on a pin 72 and has its outer endportion projecting slightly beyond the end of the guide member 60 in itsnormal position, as shown in Fig. 7. In this form of the invention thegripping element 63 is positively moved by the engagement of theprojecting end portion of the lever arm 70 by the part 42 during theformation thereof from the position shown in Fig. 7, where the serratededge 68 is substantially ush with the outer end of the guide member 60and the surface of the male die block to the position shown in Fig. 8,where the outer end of the teeth project a very slight distance justsuflcient to engage the part and remove it from the female die block.

It will be obvious that in the forms of the invention shown in Figs. lthrough 6 the tangential force exerted by the part being formed duringthe downward stroke of the male die block will tend to move the grippingelement to its innermost position and during the upward stroke the partwill exert a tangential force downwardly in the opposite direction whichtends to press the gripping element into firmer engagement with thepart.

In the form of the invention shown in Figs. 5 and 6, the serrated edgemay be slightly curved, if desired, so that only a relatively smallportion will be engaged by the part at any time, thus providing to acertain extent a rolling contact between the part and the serrated edgeof the gripping element.

In the forms shown in Figs. 1-3 and Figs. 5 and 6 a slight clearance maybe left between the upper surface of the gripping element and thesurface of the male die block or the upper edge of the slot 50, so thatthe gripping element can move to a position where the teeth do notproject at all. In this case engagement of the gripping element with thepart 42 would be dependent on the weight of the gripping elementmaintaining it in engagement with the part, which would not providepositive engagement, but the serrated edge would be less liable to scarand damage the part during the downward stroke and would ordinarilyprovide suiicient engagement during the upward stroke to remove the partfrom the female die block. l

It will be obvious to those skilled in the art that various changes maybe made in the invention without departing from. the spirit and scopethereof, and therefore the invention is not limited by that which isshown in the drawings or described in the specification, but only asindicated in the appended claims.

vWhat is claimed is:

l. A parts remover for a die press having male and female die blockssaid parts remover comprising a cylindrical plug adapted to be insertedin a hole formed in the side of the male die block, a substantiallycylindrical slide guide having a diametrical slot formed in one endthereof with an upwardly inclined inner end wall, a sliding wedgedisposed in said slot and having an inclined edge slidably engaging saidinclined wall, an elongated opening extending transversely through saidwedge with its longitudinal axis parallel to said inclined edge, a pinextending through said elongated opening and secured to said slideguide, said sliding wedge having a serrated end surface forming teeththe tips of which extend slightly beyond the end of said slide guidewhen said wedge is in extended position, said wedge having a beveledcorner at the upper end of said serrated end surface, threaded meansconnecting said plug and said slide guide, and vrecesses in the outerend surface of said slide guide for engagement by a Spanner wrench toengage or disengage said threaded means.

V2. A parts remover for a die press having male and female die blockssaid parts remover comprising a cylindrical plug adapted to be insertedin a hole formed in the male die block, a substantially cylindricalslide guide having a diametrical slot formed in one end thereof with anupwardly inclined inner end wall, a sliding wedge disposed in said slothaving an inclined edge slidably engaging said inclined wall, anelongated opening extending transversely through said wedge with itslongitudinal axis parallel to said inclined edge, a pin extendingthrough said elongated opening and secured to said slide guide, saidsliding wedge having a serrated end surface forming teeth the tips ofwhich extend slightly beyond the end of said slide guide when said wedgeis in ex tended position, and threaded means connecting said plug andsaid slide guide.

3. A male die for cooperation with a female die for forming an article,said male die having a recess formed in a side thereof adjacent theupper operative portion, an inclined cam surface in said male die recesswith the cam surface being spaced a greater distance from the surfacethereof adjacent the upper portion than at the lower portion, an articleremover in said recess mounted for movement in a direction generallyparallel to and transversely of the movement of the die, said articleremover having a cooperating cam surface for coaction with said firstmentioned cam surface whereby upward movement on said male die causesrelative downward vertical movement of the article remover relative tosaid male die producing a projecting transverse movement of saidremover, and means for preventing accidental loss of said remover fromsaid die and preventing excessive movement of said remover in itsprojecting direction.

4. A parts remover comprising a slide guide for application to a maledie in a recess formed in such die, said slide guide being provided witha slot extending inwardly from the outer end thereof and having a camsurface converging with the outer surface of the die in the direction ofoperative movement of the die, a gripper slide mounted in said slot andhaving an inclined surface cooperating with the cam surface and movablerelative to the slide and die in the direction of movement of said diewhereby movement of said gripper in the direction of operative movementof said die causes said gripper to project outwardly of said die andmovement of said gripper in the direction of withdrawal movement of saiddie relative to said die allows said gripper to move inwardly of saiddie, means for preventing accidental removal of said gripper from saidslide guide, and stop means to prevent excessive projection of saidgripper beyond the surface of the die.

5. A parts remover for a die comprising a cylindrical guide providedwith a slot extending from one end toward the other end and terminatingin an inclined cam surface at an acute transverse angle to the axis ofthe cylinder, a gripper slide mounted in said slot and having a serratedsurface substantially normal to the axis of the cylinder and having acam follower surface at an acute angle to said serrated surface forcooperation with said cam surface, said gripper slide being of lesslength than the diameter of said cylinder whereby said gripper slide maymove transversely of said cylinder and the serrated surface thereof beprojected beyond said cylindrical guide, and means between said guideand slide for maintaining said gripper slide in operative relation withsaid cylindrical guide and for preventing excessive projection of saidserrated surface beyond the said one end thereof.

6. A parts remover comprising a plug for insertion into a recess in adie, said plug having a slot therein extending from one end thereoftoward the other and terminating short of the other end with with a camsurface at an angle to the surface of the die in which it is to beinserted, a gripper slide mounted in said slot having a cam followersurface for engagement with said cam surface and a serrated articlegripping surface opposite to the follower surface, means for maintainingsaid gripper slide in said plug and for limiting the projection of saidserrated surface beyond the die whereby an article on the die is engagedwhile the article is in the cooperating dies and such article may bereleased upon separation of the dies.

7. Means for forming material comprising male and female dies, the maledie being provided with an opening in one side thereof, an articleengaging member, means for mounting said member in said opening topermit movement of said member in said opening in directions parallel toand transverse of the movement of said male die, said member beingmovable to a position in which the outer extremity extends outwardly anappreciably greater distance from the side surface of the male die, astop to limit the extent of outward movement of the member, the outerextremity of said member being movable in the direction of movement ofthe male die in the forming operation, connections between said memberand said male die to permit said member when moved relative to the maledie in the direction of forming movement of the male die being projectedoutwardly, and said member when moved in the work extracting directionrelative to the male die being withdrawn to its innermost position, theouter extremity of said member having means for positively engaging thework being formed to positively remove the work from the female die uponthe withdrawal of the male die.

8. The invention according to claim 7 in which said mounting meanscomprises a plug, a slot 'm said plug and a pivot connecting said memberand said plug.

9. The invention according to claim 7 in which said mounting meansincludes a plug for reception in the opening of the male die, meansadjustably limiting the entry of said plug in said opening to controlthe amount of projection of the member from said die.

References Cited in the le of this patent UNITED STATES PATENTS1,524,288 Burns Ian. 27, 1925 1,895,401 Simonsen et al Jan. 24, 19332,246,954 Schleinitz June 24, 1941 2,270,186 Dulmage Jan. 13, 19422,324,205 Gladfeller July 13, 1943 2,341,667 Stacy Feb. 15, 1944

